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Ventalation is one of the most important parts of your roofing system. Has proper intake air flow coming in from the eaves of your home, where your gutters are located, and exausting through the ridge of your home. All roofing manufactors require this as part of there warranty information because it does not only affect the condisation in your attic space but will also weaken your shingles and lower there live span. If your home already has proper insolation and proper ventatation another option would be to add a power fan unit on your roof near the ridge with a humidistat built it. This will turn on automatically at whatever tempature you set and also when moisture builds but will turn on. Moisture in the attic space is common in winter months due to cold tempatures outside and heat from your attic space meeting. I would have a roofing company come out and inspect your soffits to make sure they are ventalated and also to ensure you have a ridge vent installed on your home to start.
Ideally, you will have no sweating if you have proper insulation and ventialtion. Generally moisture forms by ice freezing on the bottom side of the roof sheathng or the nails sticking through tje shething and when it melts you have water( sweating.) Not good. This can lead to wet insulation, mold and deterioration of the sheathing and or framing members. Get itchecked by a professional.
Although each home is unique in design, it's safe to say that virtually every home should have a properly vented ROOF. A properly insulated home, with a properly vented roof, should not have a condensation problem.
Proper ventilation is extremely important for a long lasting roof. If you roof is sweating and creating condenstaion it can deteriorate your entire roofing system from the decking and supports to the underlayment and shingles. Also, depending on your climate, inproper ventilation will contribute to ice dams. I'd recommend cutting in a roof long ridge vent as soon as possible.
Roof ventilation is very important. Ensure that the intake from the eaves is adequate and not blocked in the attic with insulation. Ensure you have adequate exhausting on the ridges. Proper ventilation can extend the life of your roof. If you have any questions, you should consult with a roofing professional in your area.
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